"I don't know why, I just can't," he told CBS correspondent Anthony Mason. "I don't know if it's that she's so simple, and a wooden cross is part of what she would like. It probably has something to do with permanence. So, for now, I can sit out here and feel like it's — it's maybe just temporary. Although I know it's not."

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Rory sat down for an emotional interview, which will air September 4 on CBS Sunday Morning.

Though there's no headstone, Rory added a bench next to Joey's grave.

"I got a place for my coffee and her's," he says. "And we still have coffee together."

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The couple performed together as the duo Joey + Rory, but Rory says he hasn't been writing music since his wife died.

"I don't want to go on stage without her," he says. "That's what I'm thinking about right now. I just don't want to make music without her. But I also know time changes things. So I won't say never. It's just where I am today."